KUDU-2671 add tests to check for number of hash buckets

This patch adds a few test scenarios to cover the handling of invalid
number of hash buckets for range-specific hash schemas in AlterTable
RPCs.

Change-Id: I6bdd728b5dea7fa864648e167a1a76b07c706e8f
Reviewed-on: http://gerrit.cloudera.org:8080/18739
Tested-by: Alexey Serbin <alexey@apache.org>
Reviewed-by: Alexey Serbin <alexey@apache.org>
3 files changed